Try selecting “ File” > “ Save As…” and save the document as a “. You may have saved your document in a format that does not support the Equation Editor. Why is the equation editor selection grayed out? The Equation Editor will be available under the “ Insert” menu.
Click “ Close” when the install is complete.
Click “ Equation Editor“, and select “ Run from My Computer“.Click the plus sign next to “ Office Tools“.Select “Add or Remove Features“, and click “ Continue“.Select once on the “ Microsoft Office 2010/2007” entry and click “ Change“.When complete, select “ Close” and it will be available under the “ Insert” menu. Select “ Continue” and the Equation Editor will be take a few minutes to install.Select the plus sign next to “ Office Tools“, then select “ Equation Editor” > “ Run from My Computer“.Choose “ Add or Remove Features” and select “ Continue“.Select your installation of Microsoft Word or Microsoft Office in the list and select the “ Change” button.(Don’t worry, we’re not going to uninstall anything.)
Select “ All Commands” in the “ Choose commands from” menu, then add “ Symbols” to the tabs listed on the right side of the screen. If you still do not see the Equation option, you may have to go to “ File” > “ Options” > “ Customize Ribbon“. Simply select the “ Insert” tab and choose “ Equation” under the “ Symbols” section. For Word 2016 or 2013, the Equation Editor should be available by default.